History-Based Motion Vector Prediction Table Update for Affine Video Coding

The patent applies local quality by prioritizing motion information from spatially neighboring blocks over distant blocks when updating the HMVP table. Specifically, it checks whether the current block has spatial neighbors with valid motion vectors and uses those local neighbors' motion information preferentially, ensuring that the HMVP table contains motion vectors from blocks that are spatially closer and thus more relevant to the current block's motion characteristics.

The patent introduces dynamic adaptation by modifying the HMVP table update mechanism based on the coding mode and spatial relationship of blocks. When an affine coded block is encountered, the system dynamically adjusts which motion vectors are added to the HMVP table by checking for spatial neighbors and selectively incorporating their motion information, making the HMVP table content adaptive to the local motion patterns rather than following a fixed update sequence.

The patent applies preliminary action by performing a spatial neighbor check before adding motion vectors to the HMVP table. The system proactively determines whether spatially neighboring blocks exist and have valid motion vectors before proceeding with the HMVP table update, preventing the inclusion of potentially inaccurate motion information from affine coded blocks that are not spatial neighbors.

The patent implements feedback by continuously monitoring the coding mode of previously coded blocks and the spatial relationship between blocks. The system uses this feedback to dynamically adjust the HMVP table update process, stopping or modifying updates when affine coded blocks are detected without valid spatial neighbors, thereby maintaining prediction reliability based on real-time coding conditions.